1. According to United States census data, while there was about one-third of mothers with young children working outside the home in 1975 in 2000, almost two-thirds of those mothers were employed outside the home.

2. Clouds are formed from the evaporation of the oceans’ water that is warmed by the sun and rises high into the atmosphere, condensing in tiny droplets on minute particles of dust.

3. Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite’s hosts for part of its life cycle.

4. Sor Juana ln6s de Ia Cruz was making the case for women’s equality long before the cause had a name Born in the mid-seventeenth century in San Miguel Nepantla, Mexico, the convent was the perfect environment for Sor Juana to pursue intellectual pursuits, achieving renown as a mathematician, poet, philosopher, and playwright.

5. By devising an instrument made from a rod, wire, and lead balls, and employing uncommonly precise measurements, in 1797-1798 Henry Cavendish’s apparatus enabled him to arrive at an astonishingly accurate figure for the weight of the earth.

6. The growth projected for these storms in different computerized weather models varies widely.

7. By using a process called echolocation to analyze the echoes of the high-pitched sounds they produce, bats can determine not only the distance to an object, but they also can determine its shape and size and the direction in which it is moving.

8. Carbon dioxide, which traps heat in the atmosphere and helps regulate the planet’s surface temperature, is constantly being exchanged between the atmosphere on the one hand and the oceans and terrestrial plants on the other.

9. Floating in the waters of the equatorial Pacific, an array of buoys collects and transmits data on long’term interactions between the ocean and the atmosphere, interactions that affect global climate.

10.  Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.